W-CDMA Applications 
Dual-Priority W-CDMA Transmission System for Video
Primary Investigator
Hamid Gharavi: email: gharavi@nist.gov; Telephone: (301) 975-3634
Collaborator
Siavash Alamouti, Cadence Design Systems, Inc.
The wireless telecommunications industry is now planning the deployment of a third-generation of mobile systems in anticipation of growing demands for voice and multimedia services. In particular, visually based services such as video conferencing, medical emergency consultation, wireless web access, and remote site surveys might dominate future services offered to subscribers in future third-generation mobile systems. Unfortunately, existing video compression standards, developed for relatively benign, nearly error-free environments, cannot be directly applied in the more hostile communication environments experienced by mobile systems. As part of the evaluation of the CDMA-based 3G systems, NIST has been working to assist industry to enable efficient use of radio bandwidth to support audio-visual services. The work has been based on the performance testing and evaluation of the W-CDMA for transmission of ITU-T H.263 compressed video bitstream. In collaboration with Cadence Design Systems, a compatible dual-priority transmission system has been developed. The end-to-end transmission system consists of a robust video partitioning scheme and a flexible 3G W-CDMA model. A demo system has been developed and implemented in the SPW model, which provides a subjective assessment of the transmitted video over IMT-2000 channels. The enclosed images represent two video frames: without dual-priority W-CDMA transmission system (on the left), and with dual-priority W-CDMA transmission system (on the right).
For further information, please refer to:
H. Gharavi and S. M. Alamouti, "Multipriority
Video Transmission for Third-Generation Wireless Communication
Systems," Proceedings of the IEEE, vol. 87, pp. 1751-1763,
October 1999. 
|
Last modified: Tue Dec 12 12:46:07 EST 2001 |
NIST is an agency of the US
Department of Commerce's Technology
Administration
Disclaimer
- Privacy
Statement/Security Notice